As far as i know, not possible once you entered the minimum or maximum into a [flonum]. You can of course make something to store these someplace else. May get annoying when you have a lot of gui elements though:

– Pasted Max Patch, click to expand. –

Copy all of the following text. Then, in Max, select New From Clipboard.

big thx,
the bindto solution works fine, unfortunetally in my case I can’t create two pattr for each of my params (would be too much).
Perhaps someone has a simple little javascript, that reports the min and max of certain scripting-named-object?